Display device and driving method of display device

Abstract

The application discloses a display device and a driving method thereof. The display device comprises a backlight module and a transparent display panel. The backlight module is arranged on the side of the transparent display panel. The transparent display panel comprises a first display surface and a second display surface. Three layers of liquid crystal layers and three layers of total reflection layers are arranged between the first display surface and the second display surface. The backlight module comprises three light sources of different colors. The three layers of liquid crystal layers and the three layers of total reflection layers are arranged in an overlapping mode in the direction from the first display surface to the second display surface. The total reflection layers are used for totally reflecting and directly reflecting light of different angles emitted by the light sources, so that the light is transmitted to the first display surface and the second display surface respectively to realize double-side transparent display. The application realizes light mixing in the vertical direction of the display panel by arranging multiple layers of liquid crystal and reflection layers corresponding to different color light sources, and by controlling the deflection angle of the liquid crystal in the liquid crystal layer. Therefore, the double-side transparent display can be realized without a color film layer and a polaroid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display device and a driving method of the display device. BACKGROUND

[0002] With the development of display technology, various new technologies are emerging, and transparent display technology is attracting more and more attention due to its transparent display panel and unique applications. Transparent display screens are increasingly used in commercial fields. Transparent display screens not only have display functions, but also allow users to see objects behind the screen, improving information transmission efficiency and increasing user interest. At the same time, transparent display screens can integrate touch technology and intelligent display technology, have collaborative effects such as display, interaction, and advertising, and greatly improve the user experience.

[0003] In the technical field of liquid crystal display (LCD), in order to provide a light source for a display object, most transparent display devices are designed in a box type, a box structure is provided on the light-in side of the transparent display screen, and a common light source is fixed on the side of the box. The common light source can be a side-in light emitting diode (LED) structure commonly used for lighting display or backlight, and the display object is placed in the box. The light of the common light source fixed on the side of the box illuminates the display object. Due to the inherent box structure, the overall appearance is relatively bulky, the display flexibility is poor, and the human-machine interaction is lacking. Moreover, the polarizing sheet and the color film layer in the transparent display screen will affect the light transmission effect of the transparent display panel, reducing the light transmittance of the transparent display panel. SUMMARY

[0004] The purpose of the present application is to provide a display device and a driving method of the display device, which can realize double-sided transparent display of the display device.

[0005] The present application discloses a display device, which comprises a backlight module and a transparent display panel. The backlight module is arranged on the side of the transparent display panel. The transparent display panel comprises a first display surface and a second display surface arranged oppositely. Three layers of liquid crystal layers and three layers of total reflection layers are arranged between the first display surface and the second display surface. The backlight module comprises three kinds of light sources of different colors. The three kinds of light sources of different colors are arranged corresponding to the three layers of liquid crystal layers respectively, and different lights are input into the three layers of liquid crystal layers. The three layers of liquid crystal layers and the three layers of total reflection layers are arranged in an overlapping manner in the direction from the first display surface to the second display surface. The total reflection layers are used to totally reflect and directly emit the lights emitted by the light sources at different angles. By controlling the deflection angle of the liquid crystal in the liquid crystal layer, the light is transmitted to the first display surface and the second display surface respectively to realize double-sided transparent display.

[0006] Optionally, the three-layer liquid crystal layer is respectively a first liquid crystal layer, a second liquid crystal layer and a third liquid crystal layer, along the direction from the ground side of the transparent display panel to the sky side of the transparent display panel, the first liquid crystal layer comprises a plurality of first liquid crystal regions arranged at intervals, the second liquid crystal layer comprises a plurality of second liquid crystal regions arranged at intervals, and the third liquid crystal layer comprises a plurality of third liquid crystal regions arranged at intervals, the heights of the first liquid crystal regions, the second liquid crystal regions and the third liquid crystal regions from the ground side of the transparent display panel are different; along the direction from the first display surface to the second display surface, the display area of one pixel of the transparent display panel covers the first liquid crystal regions, the second liquid crystal regions and the third liquid crystal regions.

[0007] Among them, the light-emitting position of the liquid crystal molecules in the first liquid crystal region is staggered with the light-emitting position of the liquid crystal molecules in the second liquid crystal region and the third liquid crystal region.

[0008] Optionally, the three-layer total reflection layer is divided into a first total reflection layer, a second total reflection layer and a third total reflection layer, the display device comprises a first glass substrate, a second glass substrate, a third glass substrate and a fourth glass substrate, along the direction from the first display surface to the second display surface, the first glass substrate, the first liquid crystal layer, the second glass substrate, the first total reflection layer, the second liquid crystal layer, the third glass substrate, the second total reflection layer, the third liquid crystal layer, the fourth glass substrate and the third total reflection layer are sequentially stacked.

[0009] The adjacent two first liquid crystal regions, second liquid crystal regions and third liquid crystal regions are provided with transparent regions, and the first liquid crystal regions and the transparent regions are provided with light shielding regions; the refractive index of the four glass substrates is greater than the refractive index of the transparent region and the refractive index of the three-layer total reflection layer.

[0010] Optionally, along the direction from the first display surface to the second display surface, the first liquid crystal layer, the second liquid crystal layer and the third liquid crystal layer are sequentially stacked, the first liquid crystal layer is close to the first display surface, and the third liquid crystal layer is away from the first display surface; the three different color light sources are respectively red light source, green light source and blue light source, the red light source is arranged corresponding to the first liquid crystal layer to provide light source for the first liquid crystal layer, the blue light source is arranged corresponding to the second liquid crystal layer to provide light source for the second liquid crystal layer, and the green light source is arranged corresponding to the third liquid crystal layer to provide light source for the third liquid crystal layer.

[0011] Optionally, the backlight module comprises a light guide plate, the diffusion plate comprises a first light guide plate, a second light guide plate and a third light guide plate, along the direction from the top side of the transparent display panel to the ground side of the transparent display panel, the first light guide plate is arranged directly below the first liquid crystal layer, the second light guide plate is arranged directly below the second liquid crystal layer, and the third light guide plate is arranged directly below the third liquid crystal layer, and two light sources of the same color are arranged on both sides of the long side of the light guide plate.

[0012] Optionally, along the direction from the top side of the transparent display panel to the ground side of the transparent display panel, the width of the opening area of the pixel of the transparent display panel is proportional to the distance of the pixel to the light source, and the closer the pixel is to the light source, the smaller the opening area is; each pixel opening area comprises a first pixel opening area, a second pixel opening area and a third pixel opening area.

[0013] Among them, the first pixel opening area is the area providing incident light for the red light source, the second pixel opening area is the area providing incident light for the blue light source, and the third pixel opening area is the area providing incident light for the green light source; the area of the second pixel opening area is greater than the area of the first pixel opening area or the area of the third pixel opening area.

[0014] Optionally, the display device comprises a picture detection module and a light compensation module, the light compensation module comprises three different color light sources arranged on the top side of the transparent display panel, the light sources of the three different color light sources on the top side or the ground side of the transparent display panel are red light sources, green light sources and blue light sources respectively, the red light source on the top side is arranged opposite to the red light source on the ground side, the green light source on the top side is arranged opposite to the green light source on the ground side, and the blue light source on the top side is arranged opposite to the blue light source on the ground side.

[0015] The picture detection module is used to detect the brightness of the first display surface and / or the second display surface, obtain a compensation value according to the detected brightness and the brightness of the corresponding gray scale value, and the light compensation module further comprises a brightness adjustment circuit, which adjusts the luminous brightness of the light source on the top side of the transparent display panel according to the compensation value, so as to realize the brightness compensation of the first display surface and / or the second display surface of the transparent display panel.

[0016] Optionally, the display device further comprises a brightness adjustment module and a brightness detection module, the brightness adjustment module is connected with the brightness detection module; the brightness detection module is used to detect the brightness of the ambient light and generate external brightness data output to the brightness adjustment module, and the brightness adjustment module confirms the light source intensity in the brightness lookup table according to the external brightness data, generates light source brightness data to change the luminous brightness of the light source.

[0017] Optionally, the third total reflection layer is provided with an electrochromic layer on the side away from the fourth glass substrate, and the electrochromic layer receives driving data to change the degree of transparency.

[0018] The application further discloses a driving method of the display device, for driving the display device as any one of the above, comprising the steps of:

[0019] Turning on three different color light sources, and transmitting the light emitted by the light sources to the three total reflection layers;

[0020] generating a driving signal of the pixels of the first display surface or the second display surface;

[0021] dividing the driving signal into a first driving signal, a second driving signal and a third driving signal according to the driving signal; and

[0022] inputting the first driving signal, the second driving signal and the third driving signal into the corresponding three liquid crystal layers respectively, and controlling the deflection of the liquid crystal molecules in the liquid crystal layers;

[0023] The total reflection layer is used to totally reflect and directly emit the light emitted by the light sources at different angles, and the deflection angle of the liquid crystal in the liquid crystal layer is controlled to control the transmission of the light to the first display surface and the second display surface to realize double-sided transparent display.

[0024] Compared with the scheme of the double-sided transparent display device with a color film layer and a polarizer, the application uses three different color backlight light sources to provide backlight for the transparent display panel, and does not need to set the color film layer. Meanwhile, the application uses three liquid crystal layers and three total reflection layers to replace the liquid crystal molecules and the polarizer in the prior art, and then controls the deflection angle of the liquid crystal in the liquid crystal layer to realize light mixing in the vertical direction of the display panel, and realizes double-sided transparent display. Therefore, the display panel of the application can realize normal display effect without setting the polarizer and the color film layer, eliminates the shielding of the polarizer and the color film layer to the light, greatly improves the light transmittance of the transparent display panel, and optimizes the display effect of the transparent display screen. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings included are intended to provide a further understanding of the embodiments of the application, and constitute a part of the specification, for illustrating the embodiments of the application, and together with the text description, to explain the principle of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0026] Figure 1 is a structural schematic diagram of the display device of the first embodiment of the application;

[0027] Figure 2 is a display device in the second embodiment of the present application Figure 1 a schematic view of AA' section of the display device;

[0028] Figure 3 is a schematic view of the structure of the display device in the third embodiment of the present application;

[0029] Figure 4 is a schematic view of the pixel opening area of the display device in the third embodiment of the present application;

[0030] Figure 5 is a schematic view of the structure of the display device in the fourth embodiment of the present application;

[0031] Figure 6 is a schematic view of BB' section of the display device in the fourth embodiment of the present application Figure 4

[0032] Figure 7 is a schematic view of the structure of the display device in the fifth embodiment of the present application;

[0033] Figure 8 is a schematic view of the structure of the display device in the sixth embodiment of the present application;

[0034] Figure 9 is a schematic view of the driving method flow in the seventh embodiment of the present application;

[0035] Figure 10 is a schematic view of the driving method flow in the eighth embodiment of the present application.

[0036] ​Wherein, 100, display device; 101, base; 102, black frame glue; 200, transparent display panel; 210, first display surface; 220, second display surface; 230, liquid crystal layer; 231, first liquid crystal layer; 232, second liquid crystal layer; 233, third liquid crystal layer; 234, first liquid crystal region; 235, second liquid crystal region; 236, third liquid crystal region; 237, transparent area; 238, light shielding area; 240, total reflection layer; 241, first total reflection layer; 242, second total reflection layer; 243, third total reflection layer; 250, glass substrate; 251, first glass substrate; 252, second glass substrate; 253, third glass substrate; 254, fourth glass substrate; 260, pixel; 270, opening area; 271, first pixel opening area; 272, second pixel opening area; 273, third pixel opening area; 300, backlight module; 310, light source; 311, red light source; 312, green light source; 313, blue light source; 320, light guide plate; 321, first light guide plate; 322, second light guide plate; 323, third light guide plate; 400, picture detection module; 500, light supplementing module; 510, brightness adjustment circuit; 600, brightness detection module; 700, brightness adjustment module; 800, electrochromic layer. DETAILED DESCRIPTION

[0037] It needs to be understood that the terms used herein, the specific structure and functional details of the disclosure, are only for the purpose of describing specific embodiments, and are representative, but the application can be embodied in many alternative forms, and should not be interpreted as being limited to the embodiments described herein.

[0038] The application will be described in detail below with reference to the accompanying drawings and optional embodiments.

[0039] Embodiment 1:

[0040] Reference Figure 1As shown, as the first embodiment of the present application, a display device 100 is disclosed, which comprises a backlight module 300 and a transparent display panel 200, the backlight module 300 is arranged at the side of the transparent display panel 200, and when the transparent display panel 200 is placed vertically, the backlight module 300 is located below the transparent display panel 200, that is, the backlight module 300 is arranged at the side, and a base 101 is usually placed below the backlight module 300, which is used to support and fix the backlight module 300 and the display panel; the transparent display panel 200 comprises a first display surface 210 and a second display surface 220 arranged oppositely, which can be understood as the front and back surfaces of the transparent display panel 200; three layers of liquid crystal layers 230 and three layers of total reflection layers 240 are arranged between the first display surface 210 and the second display surface 220; the backlight module 300 comprises three kinds of light sources 310; the three kinds of light sources 310 are arranged at the side of the transparent display panel 200, and correspond to the three layers of liquid crystal layers 230 respectively, when the transparent display panel 200 displays, the three kinds of light sources 310 input light of different colors into the three layers of liquid crystal layers 230; the three layers of liquid crystal layers 230 and the three layers of total reflection layers 240 are arranged in an overlapping manner in the direction from the first display surface 210 to the second display surface 220; one layer of liquid crystal layer 230 and one layer of total reflection layer 240 are stacked in this manner.

[0041] In this embodiment, when the light emitted by the light sources 310 of different colors is incident into the transparent display panel 200, there is a certain angle between the light and the total reflection layer 240, which will be reflected by the total reflection layer 240, when the light is perpendicular to the total reflection layer 240, the light can pass through the total reflection layer 240, that is, the total reflection layer 240 can be used to reflect the light emitted by the light sources 310 at different angles, and the light is transmitted to the first display surface 210 and the second display surface 220 respectively by controlling the deflection angle of the liquid crystal in the liquid crystal layer 230 to realize double-sided transparent display; the present application uses three layers of liquid crystal and three layers of total reflection layer 240 instead of the liquid crystal molecules and the polarizing plate in the prior art, and then realizes light mixing in the vertical direction of the display panel by controlling the deflection angle of the liquid crystal in the liquid crystal layer 230, realizes double-sided transparent display, eliminates the shielding of the light by the polarizing plate and the color film layer, greatly improves the light transmittance of the transparent display panel 200, and optimizes the display effect of the transparent display screen.

[0042] Embodiment 2:

[0043] As Figure 2As shown, as the second embodiment of the present application, it is a further refinement of the above-mentioned first embodiment, the three-layer liquid crystal layer 230 is respectively the first liquid crystal layer 231, the second liquid crystal layer 232 and the third liquid crystal layer 233, along the direction of the ground side of the transparent display panel 200 towards the sky side of the transparent display panel 200, the first liquid crystal layer 231 includes a plurality of first liquid crystal regions 234 arranged at intervals, the second liquid crystal layer 232 includes a plurality of second liquid crystal regions 235 arranged at intervals, and the third liquid crystal layer 233 includes a plurality of third liquid crystal regions 236 arranged at intervals, the heights of the first liquid crystal regions 234 and the second liquid crystal regions 235 and the third liquid crystal regions 236 from the ground side of the transparent display panel 200 are different; along the direction of the first display surface 210 towards the second display surface 220, the display area of one pixel 260 of the transparent display panel 200 covers the first liquid crystal region 234, the second liquid crystal region 235 and the third liquid crystal region 236; wherein the light-emitting position of the liquid crystal molecules of the first liquid crystal region 234 is staggered with the light-emitting position of the liquid crystal molecules of the second liquid crystal region 235 and the third liquid crystal region 236, that is, not on the same horizontal plane; actually, two oppositely arranged pixel 260 regions on the first display surface 210 and the second display surface 220 include three different color sub-pixels 260, where the different color sub-pixels 260 correspond to the first liquid crystal region 234, the second liquid crystal region 235 and the third liquid crystal region 236 respectively, that is, the three sub-pixels 260 are staggered in the vertical direction of the first display surface 210, not horizontally arranged on the first display surface 210, and the light-emitting directions of the three sub-pixels 260 are consistent, and the light emitted by the light source 310 directly mixes after passing through the corresponding film layer.

[0044] Further, along the direction of the first display surface 210 towards the second display surface 220, the first liquid crystal layer 231, the second liquid crystal layer 232 and the third liquid crystal layer 233 are sequentially stacked, the first liquid crystal layer 231 is close to the first display surface 210, and the third liquid crystal layer 233 is away from the first display surface 210; the three different color light sources 310 are respectively red light source 311, green light source 312 and blue light source 313, the red light source 311 is arranged corresponding to the first liquid crystal layer 231 to provide light source 310 for the first liquid crystal layer 231, the blue light source 313 is arranged corresponding to the second liquid crystal layer 232 to provide light source 310 for the second liquid crystal layer 232, and the green light source 312 is arranged corresponding to the third liquid crystal layer 233 to provide light source 310 for the third liquid crystal layer 233.

[0045] The three-layer total reflection layer 240 is divided into a first total reflection layer 241, a second total reflection layer 242, and a third total reflection layer 243. The display device 100 includes a first glass substrate 251, a second glass substrate 252, a third glass substrate 253, and a fourth glass substrate 254. In the direction from the first display surface 210 to the second display surface 220, the first glass substrate 251, the first liquid crystal layer 231, the second glass substrate 252, the first total reflection layer 241, the second liquid crystal layer 232, the third glass substrate 253, the second total reflection layer 242, the third liquid crystal layer 233, the fourth glass substrate 254, and the third total reflection layer 243 are sequentially stacked. The second glass substrate 252, the third glass substrate 253, and the fourth glass substrate 254 each have a corresponding thin film transistor and a pixel 260 electrode on the side close to the corresponding liquid layer. The first glass substrate 251, the first total reflection layer 241, and the second total reflection layer 242 each have a transparent common electrode on the side close to the corresponding liquid crystal layer 230. A transparent area 237 is arranged between the adjacent first liquid crystal area 234, the second liquid crystal area 235, and the third liquid crystal area 236. An opaque area 238 is arranged between the first liquid crystal area 234 and the transparent area 237. The refractive index of the four glass substrates 250 is greater than the refractive index of the transparent area 237 and the refractive index of the three-layer total reflection layer 240.

[0046] In this embodiment, the main structure is composed of four glass substrates 250, which mainly functions to support, protect and serve as the substrate of TFT device. The light shielding area 238 on both sides of the liquid crystal molecules is mainly provided with a black resin light shielding layer BM matrix to prevent light leakage when light propagates in the liquid crystal molecules. The transparent area 237 is formed of PFA material (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer), which can make the light of other layers normally pass through. The refractive index of the transparent area 237 is also different from that of the glass substrate 250. The light reflected by the total reflection layer 240 to the transparent area 237 is not perpendicular to the light of the transparent area, which will be reflected back into the glass substrate 250. The thin film transistor device on the glass substrate 250 controls the deflection angle of the liquid crystal molecules according to the display content, controls the light intensity and adjusts the display brightness. The three-layer total reflection layer 240 (the general material can be PFA) can make the light of different colors that is incident at a specific angle in the glass substrate 250 and the total reflection wall to conduct by total reflection. The light that is vertically incident can directly pass through the total reflection wall. In addition, the transparent display panel 200 is provided with a black frame glue 102 on the top side, which absorbs stray light and plays a protective role. The lamp panel of the backlight module 300 is provided with RGB three-color light sources 310. The liquid crystal molecule matrix of different regions corresponding to RGB is arranged in a staggered manner in the vertical surface direction. The light emitting position of the R liquid crystal molecule is staggered with the G and B liquid crystal molecules. When the R liquid crystal molecule passes through the red light, it will not affect the green and blue light of the G and B liquid crystal molecules to be emitted from the front. Similarly, when the B liquid crystal molecule passes through the blue light, it will not affect the red and green light of the R and G liquid crystal molecules to be emitted from the back.

[0047] It should be noted that the RGB three-color light source 310 is incident into the glass substrate 250 at a specific angle a (a is the critical angle of glass, sin a = 1 / n, n is the refractive index of glass, and the refractive index of glass is greater than the refractive index of the total reflection wall material). At this time, since the incident angle is greater than the critical angle of glass, the light is totally reflected and conducts forward between the glass and the total reflection wall in a total reflection manner. When the external display signal is input, the TFT (thin film transistor) device at the corresponding position of the picture controls the rotation of the RGB liquid crystal molecule, at which time the total reflection transmission path of the light is destroyed. The corresponding light is emitted from the rotated liquid crystal molecule, and the corresponding picture is displayed on the glass on both sides.

[0048] Embodiment 3:

[0049] As shown in Figure 3 and Figure 4 , as a third embodiment of the present application, it is a further refinement and improvement of any of the above embodiments, as Figure 3As shown, considering that the three different color light sources 310 are mainly arranged on the ground side of the transparent display panel 200, light needs to be transmitted from the ground side to the sky side, there is a certain distance, and the light will attenuate with the increase of the distance. The farther away from the light source 310, the worse the brightness of the light, which will lead to poor display effect in the area far away from the light source 310; generally, along the direction from the sky side of the transparent display panel 200 to the ground side of the transparent display panel 200, the width of the opening area 270 of the pixel 260 of the transparent display panel 200 is proportional to the distance of the pixel 260 to the light source 310, the closer the pixel 260 to the light source 310, the smaller the opening area 270; the embodiment mainly improves the problem of poor display effect caused by insufficient brightness in the display area far away from the light source 310 by increasing the opening area 270 of the pixel 260 far away from the light source 310, and at the same time reduces the opening area 270 of the pixel 260 close to the light source 310, so that the brightness of the display area close to the light source 310 decreases, ensuring the uniform brightness of the entire display surface.

[0050] Further, as shown in Figure 4 each pixel includes three sub-pixels of red, green and blue, and in each pixel, considering that the attenuation ratio of blue light is obviously greater than that of red light and green light, the opening area 270 of each pixel 260 is further improved for the opening area 270 corresponding to the three colors of red, green and blue. Specifically, the opening area 270 of each pixel includes a first pixel opening area 271, a second pixel opening area 272 and a third pixel opening area 273; wherein the first pixel opening area 271 provides an area for the incident light of the red light source 311, the second pixel opening area 272 provides an area for the incident light of the blue light source 313, and the third pixel opening area 273 provides an area for the incident light of the green light source 312; the area of the second pixel opening area 272 is greater than the area of the first pixel opening area 271 or the area of the third pixel opening area 273, so as to increase the transmittance of blue light by increasing the opening of blue light, so that the overall transmittance of blue light is the same as that of red light and green light, avoiding color yellowing caused by insufficient blue light.

[0051] Embodiment 4:

[0052] As shown in Figure 5 and Figure 6As shown, as the fourth embodiment of the present application, it is a further improvement of any of the above embodiments, the backlight module 300 includes a light guide plate 320, the diffusion plate includes a first light guide plate 321, a second light guide plate 322 and a third light guide plate 323, along the direction from the sky side of the transparent display panel 200 to the ground side of the transparent display panel 200, the light guide plate enables the light source to emit light into the glass substrate at a specific angle a, and then the reflection layer realizes total reflection or direct reflection, the first light guide plate 321 is arranged directly below the first liquid crystal layer 231, the second light guide plate 322 is arranged directly below the second liquid crystal layer 232, and the third light guide plate 320 is arranged directly below the third liquid crystal layer 233, two light sources 310 of the same color are arranged on both sides of the long side of the light guide plate 320, so that the point light source 310 becomes a uniform surface light source 310.

[0053] In this embodiment, a light guide plate 320 is arranged below each liquid crystal layer 230, two light sources 310 of the same color are arranged on both sides of each light guide plate 320, for example, two red light sources 311 are arranged on both sides of the first light guide plate 321 below the first liquid crystal, the light sources 310 on both sides are transmitted to the middle area through the light guide plate 320, and then emitted into the glass substrate 250, so that it is not necessary to arrange a light source 310 corresponding to each column of liquid crystal layers 230 or liquid crystal pixel 260 areas, thereby reducing the number of light sources 310, and the three light guide plates 320 are not connected, and there is no problem of mutual crosstalk of different colors of light. Of course, the three light guide plates 320 can be arranged integrally, for example, a whole light guide plate 320 is divided into three areas, and a partition such as a black matrix is arranged between two adjacent areas, thereby avoiding mutual crosstalk of light between the light guide plates 320.

[0054] Embodiment 5:

[0055] As Figure 7As shown, as the fifth embodiment of the present application, it is a further improvement of the first embodiment, the second embodiment and the fourth embodiment, the display device 100 comprises a picture detection module 400 and a light compensation module 500, the light compensation module 500 comprises three different color light sources 310 arranged on the top side of the transparent display panel 200, the light sources 310 on the top side or the bottom side of the transparent display panel 200 are respectively red light sources 311, green light sources 312 and blue light sources 313, the red light sources 311 on the top side are arranged opposite to the red light sources 311 on the bottom side, the green light sources 312 on the top side are arranged opposite to the green light sources 312 on the bottom side, and the blue light sources 313 on the top side are arranged opposite to the blue light sources 313 on the bottom side; the picture detection module 400 is used to detect the brightness of the first display surface 210 and / or the second display surface 220, and obtain a compensation value according to the detected brightness and the brightness of the corresponding gray scale value, and the light compensation module 500 further comprises a brightness adjustment circuit 510, which adjusts the luminous brightness of the light sources 310 on the top side of the transparent display panel 200 according to the compensation value, so as to realize the brightness compensation of the first display surface 210 and / or the second display surface 220 of the transparent display panel 200.

[0056] The embodiment considers the case that the display area far away from the bottom side light source 310 may appear insufficient brightness, which is different from the third embodiment, instead of adjusting the size of the pixel 260 opening area 270, the embodiment additionally increases the light compensation module 500 on the bottom side of the transparent display panel 200, the light compensation module 500 comprises three different color light sources 310 arranged on the top side of the display device 100, the red light sources 311 on the top side and the red light sources 311 on the bottom side both provide light sources 310 for the first liquid crystal layer 231, the green light sources 312 on the top side and the green light sources 312 on the bottom side both provide light sources 310 for the second liquid crystal layer 232, and the blue light sources 313 on the top side and the blue light sources 313 on the bottom side both provide light sources 310 for the third liquid crystal layer 233; the picture detection block is used to detect the brightness of the first display surface 210 and / or the second display surface 220, and obtain a compensation value according to the detected brightness and the brightness of the corresponding gray scale value, and the light compensation module 500 further comprises a brightness adjustment circuit 510, which adjusts the luminous brightness of the light sources 310 on the top side of the transparent display panel 200 according to the compensation value, so as to realize the brightness compensation of the first display surface 210 and / or the second display surface 220 of the transparent display panel 200; the light emitted by the light sources 310 on the top side acts as the backlight 310 of the transparent display panel 200, so only when the transparent display panel 200 displays, whether to turn on the light sources 310 on the top side is selected.

[0057] Embodiment 6:

[0058] AsFigure 8 As shown in the sixth embodiment of the present application, it is a further improvement of the second embodiment, the display device 100 further comprises a brightness adjustment module 700 and a brightness detection module 600, the brightness adjustment module 700 is connected with the brightness detection module 600; the brightness detection module 600 is used to detect the ambient light brightness and generate external brightness data output to the brightness adjustment module 700, the brightness adjustment module 700 confirms the light source 310 intensity in the brightness lookup table according to the external brightness data, generates light source 310 brightness data to change the light emitting brightness of the light source 310.

[0059] Considering that the double-sided transparent display emits light from the bottom side of the transparent display panel 200, the picture can be seen from the front and back, and the pictures in front and back may be affected by the ambient light. Generally, in the case of strong external light, it may cause differences in display effect on both sides. At this time, the brightness detection module 600, such as a light sensing sensor, can be used to measure the brightness of the external ambient light and generate external brightness data output to the brightness adjustment module 700. The brightness adjustment module 700 confirms the light source 310 intensity in the brightness lookup table according to the external brightness data, generates light source 310 brightness data to change the light emitting brightness of the light source 310. When the external light is strong, the driving voltage can be reduced to reduce power consumption.

[0060] Further, the third total reflection layer 243 is provided with an electrochromic layer 800 on the side away from the fourth glass substrate 254. The electrochromic layer 800 receives driving data to change the transparency, for example, the electrochromic layer 800 becomes opaque after receiving the driving data of single-sided display, and becomes transparent, semi-transparent or 20% transparent, 70% transparent after receiving the driving data of double-sided transparent display, thereby playing a role in assisting the adjustment of gray scale. When the picture displayed on the first display surface 210 is not desired to be seen by the person on the second display surface 220, the electrochromic layer 800 can be directly changed to opaque, so that the light cannot pass through, and the person on the second display surface 220 cannot see the picture on the first display surface 210. Considering that the second display surface 220 is generally placed outside, the light on the outside has a greater impact on the display of the second display surface 220. At this time, the transparency of the electrochromic layer 800 can be adjusted, that is, the gray scale data is changed, so as to adjust the display brightness.

[0061] Embodiment 7:

[0062] Reference Figure 9 As shown in the seventh embodiment of the present application, a driving method of a display device 100 is disclosed, which is used to drive the display device 100 as described in any of the above embodiments. The driving method comprises the steps of:

[0063] S1: turn on three different color light sources 310, and make the light emitted by the light sources 310 transmit to the three layers of total reflection layer 240;

[0064] S2: generate a driving signal of the pixel 260 of the first display surface 210 or the second display surface 220;

[0065] S3: divide the driving signal into a first driving signal, a second driving signal and a third driving signal according to the driving signal; and

[0066] S4: input the first driving signal, the second driving signal and the third driving signal to the corresponding three layers of liquid crystal layer 230 respectively, and control the liquid crystal molecules in the liquid crystal to deflect;

[0067] The total reflection layer 240 is used to make the light emitted by the light source 310 at different angles to be totally reflected and directly reflected, and by controlling the deflection angle of the liquid crystal in the liquid crystal layer 230, the light is transmitted to the first display surface 210 and the second display surface 220 respectively to realize double-sided transparent display.

[0068] The three driving signals include a data signal and a gate signal, and the light of three different colors is transmitted to the three layers of liquid crystal respectively. The opening of the thin film transistor can be controlled by the corresponding driving signal to control the deflection state of the liquid crystal. Since the three layers of liquid crystal layer 230 are stacked, three driving signals are needed to control the corresponding thin film transistor to control the liquid crystal deflection. The three layers of liquid crystal layer 230 are equivalent to the pixel 260 area of the three sub-pixels 260, and the light size of the pixel 260 area is realized by the first driving signal, the second driving signal and the third driving signal.

[0069] Further, as shown in Figure 10 the eighth embodiment of the present application is a further improvement of the above-mentioned seventh embodiment. The driving method further comprises the steps of:

[0070] S5: detecting the display mode of the display device 100; and

[0071] S6: if it is a double-sided transparent display mode, generating a first data driving signal and a first electrochromic layer 800 control signal to the driving circuit of the glass substrate 250 of the double-sided transparent display panel 200 and the electrochromic layer 800 to control the deflection angle of the liquid crystal, and the electrochromic layer 800 is transparent to realize double-sided transparent display; if it is a single-sided display mode, generating a second data driving signal and a second electrochromic layer 800 control signal to the driving circuit of the glass substrate 250 of the double-sided transparent display panel 200 and the electrochromic layer 800 to control the deflection angle of the liquid crystal, and the electrochromic layer 800 is opaque to realize single-sided display;

[0072] The first data driving signal and the second data driving signal are the same, and the first electrochromic layer 800 control signal and the second electrochromic layer 800 control signal are a pair of opposite level signals.

[0073] In the embodiment, the electrochromic layer 800 is arranged on the side of the third total reflection layer 243 away from the fourth glass substrate 254. In different display modes, for example, the electrochromic layer 800 becomes opaque after receiving the driving data for single-sided display, thereby realizing single-sided display. The electrochromic layer 800 becomes transparent after receiving the driving data for double-sided transparent display, thereby realizing double-sided transparent display. The electrochromic layer 800 can also become translucent or 20% transparent or 70% transparent, thereby playing a role in assisting in adjusting the gray scale. If the picture displayed on the first display surface 210 is not desired to be seen by the person on the second display surface 220, the electrochromic layer 800 can be directly changed to be opaque, so that light cannot pass through, and the person on the second display surface 220 cannot see the picture displayed on the first display surface 210. Considering that the second display surface 220 is generally placed outside, the light on the outside has a greater impact on the display of the second display surface 220. At this time, the transparency of the electrochromic layer 800 can be adjusted, that is, the gray scale data is changed, thereby adjusting the display brightness.

[0074] It should be noted that the steps involved in the present scheme are not limited to the order of execution, for example, detecting the state of the display device and detecting the display mode of the display device can be detected simultaneously, or the state of the display device can be detected first and then the display mode of the display device can be detected, or the display mode of the display device can be detected first and then the state of the display device can be detected, that is, the steps written in the front can be executed first, or can be executed later, or can be executed simultaneously, as long as the present scheme can be implemented, it should be considered to belong to the protection scope of the present application.

[0075] It should be noted that the inventive concept of the present application can form a very large number of embodiments, but the length of the application file is limited and cannot be listed one by one, therefore, on the premise of not conflicting, the above described embodiments or technical features can be combined to form new embodiments, and the combination of the embodiments or technical features will enhance the original technical effect.

[0076] The above is a further detailed description of the present application in combination with specific optional embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered to belong to the protection scope of the present application.

Claims

1. A display device, characterized by comprising: The display device comprises a backlight module and a transparent display panel, the backlight module is arranged on the side of the transparent display panel, and the transparent display panel comprises a first display surface and a second display surface arranged oppositely. The first display surface and the second display surface are provided with three layers of liquid crystal layers and three layers of total reflection layers; the backlight module comprises three light sources of different colors; the three light sources of different colors are arranged corresponding to the three layers of liquid crystal layers respectively, and different color lights are input into the three layers of liquid crystal layers; the three layers of liquid crystal layers and the three layers of total reflection layers are arranged in overlapping manner in the direction from the first display surface to the second display surface of the transparent display panel. The total reflection layer is used for totally reflecting the light of a specific angle emitted by the light source and making the light vertically incident on the total reflection layer directly, and by controlling the deflection angle of the liquid crystal in the liquid crystal layer, the light is transmitted to the first display surface and the second display surface respectively to realize double-side transparent display. The three layers of liquid crystal layers are a first liquid crystal layer, a second liquid crystal layer and a third liquid crystal layer, in the direction from the ground side of the transparent display panel to the sky side of the transparent display panel, the first liquid crystal layer comprises a plurality of first liquid crystal regions arranged at intervals, the second liquid crystal layer comprises a plurality of second liquid crystal regions arranged at intervals, and the third liquid crystal layer comprises a plurality of third liquid crystal regions arranged at intervals, the heights of the first liquid crystal regions, the second liquid crystal regions and the third liquid crystal regions from the ground side of the transparent display panel are different; in the direction from the first display surface to the second display surface, the display area of one pixel of the transparent display panel covers the first liquid crystal regions, the second liquid crystal regions and the third liquid crystal regions. The light emitting positions of the liquid crystal molecules of the first liquid crystal regions are staggered with the light emitting positions of the liquid crystal molecules of the second liquid crystal regions and the third liquid crystal regions. The three layers of total reflection layers are divided into a first total reflection layer, a second total reflection layer and a third total reflection layer, the display device comprises a first glass substrate, a second glass substrate, a third glass substrate and a fourth glass substrate, in the direction from the first display surface to the second display surface, the first glass substrate, the first liquid crystal layer, the second glass substrate, the first total reflection layer, the second liquid crystal layer, the third glass substrate, the second total reflection layer, the third liquid crystal layer, the fourth glass substrate and the third total reflection layer are sequentially laminated. Transparent regions are arranged between two adjacent first liquid crystal regions, two adjacent second liquid crystal regions and two adjacent third liquid crystal regions, and light shielding regions are arranged between the first liquid crystal regions and the transparent regions; the refractive indexes of the four glass substrates are greater than the refractive indexes of the transparent regions and the three layers of total reflection layers.

2. The display device of claim 1, wherein, The first liquid crystal layer, the second liquid crystal layer and the third liquid crystal layer are sequentially stacked in a direction from the first display surface to the second display surface, the first liquid crystal layer is close to the first display surface, and the third liquid crystal layer is away from the first display surface; the three different color light sources are a red light source, a green light source and a blue light source, the red light source is arranged corresponding to the first liquid crystal layer and provides light source for the first liquid crystal layer, the blue light source is arranged corresponding to the second liquid crystal layer and provides light source for the second liquid crystal layer, and the green light source is arranged corresponding to the third liquid crystal layer and provides light source for the third liquid crystal layer.

3. The display device according to claim 1 or 2, wherein The backlight module comprises a light guide plate, the light guide plate comprises a first light guide plate, a second light guide plate and a third light guide plate, and in a direction from a top side of the transparent display panel to a bottom side of the transparent display panel, the first light guide plate is arranged directly below the first liquid crystal layer, the second light guide plate is arranged directly below the second liquid crystal layer, and the third light guide plate is arranged directly below the third liquid crystal layer, and two light sources of the same color are arranged on both sides of the long side of the light guide plate.

4. The display device of claim 1, wherein In a direction from a top side of the transparent display panel to a bottom side of the transparent display panel, the width of the opening area of the pixel of the transparent display panel is proportional to the distance of the pixel to the light source, and the closer the pixel is to the light source, the smaller the opening area is; each pixel opening area comprises a first pixel opening area, a second pixel opening area and a third pixel opening area; The first pixel opening area is a region for providing incident light for the red light source, the second pixel opening area is a region for providing incident light for the blue light source, and the third pixel opening area is a region for providing incident light for the green light source; the area of the second pixel opening area is greater than the area of the first pixel opening area or the area of the third pixel opening area.

5. The display device of claim 1, wherein The display device comprises a picture detection module and a light compensation module, the light compensation module comprises three different color light sources arranged on the top side of the transparent display panel, the light sources of the three different color light sources on the top side or the bottom side of the transparent display panel are a red light source, a green light source and a blue light source, the red light source on the top side is arranged opposite to the red light source on the bottom side, the green light source on the top side is arranged opposite to the green light source on the bottom side, and the blue light source on the top side is arranged opposite to the blue light source on the bottom side; The picture detection module is used for detecting the brightness of the first display surface and / or the second display surface, obtaining a compensation value according to the detected brightness and the brightness of the corresponding gray scale value, and the light compensation module further comprises a brightness adjustment circuit, the brightness adjustment circuit adjusts the luminous brightness of the light source on the top side of the transparent display panel according to the compensation value, so as to realize the brightness compensation of the first display surface and / or the second display surface of the transparent display panel.

6. The display device of claim 1, wherein The display device further comprises a brightness adjusting module and a brightness detecting module, the brightness adjusting module is connected with the brightness detecting module; the brightness detecting module is used for detecting ambient light brightness and generating external brightness data output to the brightness adjusting module, the brightness adjusting module confirms light source intensity in a brightness lookup table according to the external brightness data, generates light source brightness data to change the light emitting brightness of the light source.

7. The display device of claim 6, wherein The third total reflection layer is provided with an electrochromic layer on the side away from the fourth glass substrate, and the electrochromic layer receives driving data to change the transparency.

8. A driving method of a display device, for driving the display device according to any one of claims 1 to 7, characterized by, The method comprises the steps of: Turning on light sources of three different colors and transmitting the light emitted by the light sources to three total reflection layers; Generating driving signals of the pixels of the first display surface or the second display surface; According to the driving signals, the driving signals are divided into a first driving signal, a second driving signal and a third driving signal; And The first driving signal, the second driving signal and the third driving signal are respectively input to the corresponding three liquid crystal layers, and the deflection of the liquid crystal molecules in the liquid crystal is controlled; The total reflection layer is used for totally reflecting the light of a specific angle emitted by the light source and making the light vertically incident on the total reflection layer to be directly transmitted, and by controlling the deflection angle of the liquid crystal in the liquid crystal layer, the transmission of the light to the first display surface and the second display surface is controlled to realize double-sided transparent display.

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